微型鼓泡器中甲烷水合物的生成特性

研究了高压鼓泡装置中进气速率、压力、温度及滤网目数对纯水体系甲烷水合物的生成动力学和形态的影响。实验结果表明,提高进气速率和压力、降低温度均可提高甲烷水合物的生成速率,但随着进气速率的提高,甲烷气体转化率减小;增加滤网可显著提高水合物生成速率和甲烷气体转化率,最优的滤网目数为200目。甲烷水合物极易在气液界面生成,形成水合物泡。进气速率对水合物形态有显著影响,进气速率较低时水合物泡保持原有形态不易被破坏,不断聚集,水合物较疏松;进气速率较高时,气体溢出,水合物易变形破裂,不断堆积,水合物较致密。压力和温度对水合物形态的影响较小;增加滤网可显著减小气泡体积,形成较多的水合物泡

圈养华南虎血常规正常参考值的初步研究

以建立华南虎血液血常规指标的正常参考值范围为目的，选取国内各动物园和繁育基地饲养的健康华南虎采集血液样本作为研究对象，采用全自动（兽用）血常规分析仪的电阻抗法和射频技术测定血常规指标［白细胞（WBC）、红细胞（RBC）、血红蛋白（HGB）、血小板（PLT）等］。华南虎血液血常规指标的正常参考值范围（95%概率）：WBC（5.45—18.92）109/L、RBC（5.95—10.21）1012/L、HGB（102—187）g/L、PLT（24—621）109/L等，不同性别间华南虎血常规各项指标差异不显著（P>0.05），与其他虎亚种相关血常规指标存在差异。华南虎血常规指标正常参考值范围不同于其他虎亚种，建立华南虎血常规指标正常值对华南虎的饲养管理、疾病诊治预防和保育繁殖研究工作很有必要

华南虎染色体核型分析及带型模式建立研究

采用外周血淋巴细胞培养及G带染色体标本制作技术，研究和分析华南虎（Panthera tigris amoyensis）染色体的核型和带型。结果表明：华南虎二倍体染色体数为 2n=38条，其中常染色体18对，性染色体1对。常染色体按相对长度从长到短依次编号为1~18。根据着丝粒指数可将华南虎染色体分为4组，即A组（m），包括2、5、13、18和X；B组（Sm），包括1、4、7、8、9、10、11、12、14、17和Y；C组（St），包括3、6；D组（t），包括15、16。核型公式为8（m）+20（Sm）+4（St）+4（t），XY（m，Sm）/XX（m，m）。本研究成功制备了华南虎染色体核型标本，初步建立了华南虎染色体G带核型模式图谱。经比对，发现华南虎与东北虎（P.t.altaica）染色体核型存在明显差异，可为虎亚种的分类研究提供依据，同时能为华南虎种群基因多样性及遗传学研究提供新的参考和开辟新的途径

2 左主幹部閉塞による急性心筋梗塞に対する補助循環下Primary PCIの経験(II.テーマ演題,第253回新潟循環器談話会)

departmental bulletin pape

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel

JUNO sensitivity on proton decay p → ν K + searches*

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the $p\to \bar{\nu} K^+$ mode with JUNO is investigated. The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar{\nu} K^+$ is 36.9% ± 4.9% with a background level of $0.2\pm 0.05({\rm syst})\pm$$0.2({\rm stat})$ events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is $9.6 \times 10^{33}$ years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies

Prediction of Energy Resolution in the JUNO Experiment

International audienceThis paper presents the energy resolution study in the JUNO experiment, incorporating the latest knowledge acquired during the detector construction phase. The determination of neutrino mass ordering in JUNO requires an exceptional energy resolution better than 3% at 1 MeV. To achieve this ambitious goal, significant efforts have been undertaken in the design and production of the key components of the JUNO detector. Various factors affecting the detection of inverse beta decay signals have an impact on the energy resolution, extending beyond the statistical fluctuations of the detected number of photons, such as the properties of liquid scintillator, performance of photomultiplier tubes, and the energy reconstruction algorithm. To account for these effects, a full JUNO simulation and reconstruction approach is employed. This enables the modeling of all relevant effects and the evaluation of associated inputs to accurately estimate the energy resolution. The study reveals an energy resolution of 2.95% at 1 MeV. Furthermore, the study assesses the contribution of major effects to the overall energy resolution budget. This analysis serves as a reference for interpreting future measurements of energy resolution during JUNO data taking. Moreover, it provides a guideline in comprehending the energy resolution characteristics of liquid scintillator-based detectors